There is a false and, frankly, environmentally dangerous assumption that we need to breed animals to create healthy soils and sequester carbon.
Why pass plants through animals, who turn them into greenhouse gases and imbue them with dangerous bacteria like E.coli and salmonella, and call it fertilizer. Bypass the animal and use green manure, i.e. compost and create a more sustainable and safe world.
We have to be brave enough to get rid of decades of indoctrination that we need to breed animals and be willing to learn new ways of farming that do not create harmful GHGs, DO sequester carbon in the soil and grow safer more nutritious foods without using animal inputs. It's called veganic farming and there are many farmers already doing it.